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Presented By: Department of Physics

Special Cosmology Seminar | Reconstructed Gravity from Cosmological Data

Alessandra Silvestri (Lorentz Institute for Theoretical Physics, Leiden University)

The era of precision Cosmology is around the corner, and it promises to shed light on some long-standing questions, such as the nature of gravity on large cosmological scales. However, current data can already tell us something!

In this talk I will discuss what we can learn about gravity from Large Scale Structure and Cosmic Microwave Background data, showing the outcome of a non-parametric reconstruction of gravity from currently available cosmological data sets. I will also discuss the imprints of cosmological tensions in the reconstructed theory and whether late time modifications of gravity can solve both the H_0 and S_8 tensions. I will also compare the non-parametric reconstruction with the best fit result for some simplified parametrizations that we often employ when fitting data, discussing their shortcomings.

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